| abstract |
The present invention is an additive (B) containing a high molecular weight polyurethane (A) having a number average molecular weight of at least 10 kg / mol and a weight average molecular weight of at least 20 kg / mol and a mercaptan group, a hydrazide group and / or an N-alkylamide group (B). Aqueous dispersions, methods for preparing the same, and their use as surface protective coatings, in particular automotive surface protective coatings. |